/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.commons.concurrent;

import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

public class IoTThreadFactory implements ThreadFactory {

    private static final AtomicInteger poolNumber = new AtomicInteger(1);
    private final ThreadGroup group;
    private final AtomicInteger threadNumber = new AtomicInteger(1);
    private final String namePrefix;
    private Thread.UncaughtExceptionHandler handler = new IoTDBDefaultThreadExceptionHandler();

    /**
     * Constructor of IoTThreadFactory.
     */
    public IoTThreadFactory(String poolName) {
        SecurityManager s = System.getSecurityManager();
        group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
        // thread pool name format : pool-number-IoTDB-poolName-thread-
        this.namePrefix = "pool-" + poolNumber.getAndIncrement() + "-IoTDB-" + poolName + "-";
    }

    public IoTThreadFactory(String poolName, Thread.UncaughtExceptionHandler handler) {
        this(poolName);
        this.handler = handler;
    }

    @Override
    public Thread newThread(Runnable r) {
        // thread name format : pool-number-IoTDB-poolName-thread-threadnum
        Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
        if (t.isDaemon()) {
            t.setDaemon(false);
        }
        if (t.getPriority() != Thread.NORM_PRIORITY) {
            t.setPriority(Thread.NORM_PRIORITY);
        }
        t.setUncaughtExceptionHandler(handler);
        return t;
    }
}
